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What does colcothar mean?

Looking for the meaning or definition of the word colcothar? Here's what it means.

Noun
  1. (organic chemistry) Polishing rouge; a reddish-brown oxide of iron, used in polishing glass, and also as a pigment; crocus Martis.
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Examples
A factitious article is prepared by calcining a mixture of colcothar and red ochre.
When the cork or wooden disc edged with hat felt is used for polishing, putty or colcothar is applied to it.
When this colcothar hath undergone a violent fire, as in the experiment now related, scarce any Acid remains therein.
The wooden disc is also employed for this purpose with putty, colcothar, or washed tripoli.
Emery with oil is used for grinding down, and tin-putty or colcothar for polishing.

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